Look up: porphyroblast


  1. Porphyroblast
    A porphyroblast is a large mineral crystal in a metamorphic rock which has grown within the finer grained groundmass. Porphyroblasts are commonly euhedral crystals, but can also be partly to completely irregular in shape. The most common porphyroblasts in metapelites (metamorphosed mudstones and si...
    Found op http://en.wikipedia.org/wiki/Porphyroblast

  2. porphyroblast
    (from the article `metamorphic rock`) ...crystals showing planar surfaces—namely, magnetite, garnet, epidote, mica, calcite, quartz, and feldspar. Minerals that have a tendency to form ...
    Found op http://www.britannica.com/eb/a-z/p/95

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